
#box{
	width: 300px;
	height: 300px;
	border: 1px solid red;
	overflow: hidden;
	position: relative;
}

#mid{
	width: 1500px;
	height: 300px;
	background: gray;
	position: absolute;
}

.index{
	width: 300px;
	height: 300px;
	background: yellow;
	font: 50px/300px "simhei";
	float: left;
}